The correct answer is A. Theater produced in Athens, 5th Century, BC
Explanation
Greek theater is an artistic expression that began in Athens during the 5th century BC. C. It was characterized by performing theatrical performances offered based on religious ceremonies represented through tragedy, comedy, and satire.
Another important aspect of the Greek Theater was the stages that were built in the open air, next to a hill, with a stage and a large back wall, surrounded by steps in the shape of a semicircle, where the public sat. According to the above, the correct answer is A. Theater produced in Athens, 5th Century, BC
Answer: Marie Curie studied the radiation of all compounds containing the known radioactive elements, including uranium and thorium, which she later discovered was also radioactive. She also found out that:
- you can exactly measure the strength of the radiation from uranium;
- the intensity of the radiation is proportional to the amount of uranium or thorium in the compound - no matter what compound it is;
- the ability to emit radiation does not depend on the arrangement of the atoms in a molecule; it must be linked to the interior of the atom itself - a revolutionary discovery!
When she realized that some uranium and/or thorium compounds had stronger radiation than uranium, she made the following hypothesis: there must be an unknown element in the compound which had a stronger radiation than uranium or thorium. Her work aroused the interest of her husband, Pierre Curie, who stopped his own research on crystals and joined the "detective work" with his wife. And Marie was proven right
